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  • WordNet 3.6
    • n pepsin an enzyme produced in the stomach that splits proteins into peptones
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Pepsi got its name from the ingredient pepsin, which is said to aid in digestion, however, it is not known
    • n Pepsin pĕp"sĭn (Physiol. Chem) A proteolytic enzyme (MW 34,500) contained in the secretory glands of the stomach. In the gastric juice it is united with dilute hydrochloric acid (0.2 per cent, approximately) and the two together constitute the active portion of the digestive fluid. It degrades proteins to proteoses and peptides, and is notable for having a very low pH optimum for its activity. It is the active agent in the gastric juice of all animals.☞ As prepared from the glandular layer of pigs' or calves' stomachs it constitutes an important article of pharmacy.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Pepsi originally contained pepsin, (the same stuff in pepcid AC) thus the name
    • n pepsin The proteolytic ferment found in the gastric juice. In the presence of a weak acid it converts proteids into peptones, but in neutral or alkaline solutions it is inert. It is used in therapeutics, in a more or less pure state, in cases of indigestion, and as a solvent for diphtheritic membranes and other superficial necroses.
    • ***
Chambers's Twentieth Century Dictionary
    • n Pepsin pep′sin one of the essential constituents of the gastric juice: the active agent in fermenting food in the stomach—a hydrolytic ferment
    • ***


Webster's Revised Unabridged Dictionary
Gr. pe`psis a cooking, digesting, digestion, fr. pe`ptein pe`ssein, to cook, digest: cf. F. pepsine,. Cf. Dyspepsia
Chambers's Twentieth Century Dictionary
Fr.,—Gr. pepsis, digestion—peptein, to digest.


In literature:

Some rhubarb-and-soda mixture on the shelf in the bathroom, and a little box of pepsin tablets.
"One Basket" by Edna Ferber
I wish these story writers would let a fellow have a pepsin tablet, anyhow, between feeds.
"Whirligigs" by O. Henry
I saw a package of peppermint-pepsin in your place the other day.
"Roads of Destiny" by O. Henry
The dish suits them; only, by the action of their pepsin, it becomes so fluid that they die submerged.
"The Life of the Fly" by J. Henri Fabre
Add to each a few grains of pepsin.
"A Practical Physiology" by Albert F. Blaisdell
It was a bottle of pepsin bitters!
"Fighting in Flanders" by E. Alexander Powell
The pepsin is added to the mixture only when warm, and is injected at once.
"The Mother and Her Child" by William S. Sadler
A noticeable difference, however, is observed in the rapidity with which the albumin and proteids are dissolved in a pepsin solution.
"Human Foods and Their Nutritive Value" by Harry Snyder
Pepsin (pure) 128 grains.
"Scientific American Supplement, No. 1157, March 5, 1898" by Various
Also the Old Boarder who was always under the influence of Pepsin.
"The Wit and Humor of America, Volume VIII (of X)" by Various
The activity of pepsin does not become manifest until there is about 0.3 per cent.
"Outlines of Dairy Bacteriology, 8th edition" by H. L. Russell
I began taking syrup of pepsin to artificially digest my food and thus take some of the burden off my stomach.
"Confessions of a Neurasthenic" by William Taylor Marrs
Literature was to have its once terrible ferments reduced to the quality of a helpful pepsin.
"The Wife of Sir Isaac Harman" by H. G. (Herbert George) Wells
F., add essence of pepsin and stir thoroughly.
"Dietetics for Nurses" by Fairfax T. Proudfit
This phenomenon has been studied in connection with the zymogens of the digestive proteases, pepsin and trypsin.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
Luciferase is destroyed only by pepsin (probably), trypsin, erepsin, and something in spleen and liver extract.
"The Nature of Animal Light" by E. Newton Harvey
They may be made less irritating by giving them with essence of pepsin.
"Arteriosclerosis and Hypertension:" by Louis Marshall Warfield
F., ten drops of rennet extract or pepsin is added to each jar.
"The Book of Cheese" by Charles Thom and Walter Warner Fisk
SHAKLEE, A. O., and MELTZER, S. J.: (1) The Mechanical Destruction of Pepsin, Am.
"Scurvy Past and Present" by Alfred Fabian Hess
I would sooner eat a box of tin tacks than an ordinary English dinner at half-past eight, without my pepsine.
"The Rubicon" by E. F. Benson

In news:

Moisture, Oil Ash Pepsin Digestibility Ammonia Nitrogen.
The authors develop a pratical approach to avoid unwanted interactions between pepsin and SLS in dissolution Tier II tests.
We conducted a literature review to identify elements of duodenogastroesophageal reflux (DGER)—namely pancreatic fluids, hydrochloric acid, pepsin, and bile—as to the effects each has when refluxed to the extraesophageal structures.